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  1. #1

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    problems with knock sensor after taking engine out? ['04 RXP]

    I took my ski out for the first time today since having the head repaired and new pistons (following rear exhaust valve failure). I took out and put the engine back in myself but had the work done by a specialist in the UK. Everything seems fine but I am getting an error code (I've forgotten it!!! but when I looked it up it said knock sensor out of range). Anyone know why this might be? Is there a special way to install the knock sensor? The "check engine" warning and code does't come up until you do over 5,000 RPM. (oh and I'm using 95 fuel)

    Cheers in advance.


  2. #2
    Every adventure comes to an end........ Not Today! wreckingball's Avatar
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    Is there any corrosion in the terminal connector?

  3. #3
    oct6454's Avatar
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    I had this exact same problem after if filled my was filled with 87. Mine then never went away and would always kick in. Still havent figured out what it is so im ordering the pig tail in hopes that is will fix the problem.

  4. #4
    LPG256's Avatar
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    +1 oct6454

    campaign # 2004-0005 is a Recalibration & Knock Sensor Update
    it says that it is an update for lower grade fuels, but we found them to be throwing codes even with good octane.

    278 002 050 is the harness adapter # it takes about 10 minutes to install

  5. #5

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    My ski has the upgraded pig tail harness. Could I have bolted the sensor on incorrectly, does it have to go a certain way? A friend was helping me the rebuild and we had to use a different bolt as we couldn't find the bolt we took out, we did check it was the right size. Keen to get this fixed before the season starts again.

    One other question, I think I'm right in saying the ski has to rev above 5k to get the system to check the knock sensor, is this right?

    Thanks

    A.

  6. #6
    imp0ster's Avatar
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    Knock sensors are based off of harmonics. If anything is clanking around it can throw false KR. I know know what the sensors on our skis look like but if it's fully external, wrap it in Dynamat and make damn sure it's torqued properly. These two very simple steps have fixed solved many ghost KR issues when tuning

  7. #7

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    I ran the ski up today (on the hosepipe not in the ocean) and the knock sensor problem didn't showup, even rev'ing up above 5k, so I'm hoping it's fixed. Guess I need to try it in the ocean. Just for clarity the error I was getting was sensor out of range not that it was detecting a fault.

    I'll update the post when I've tried in the ocean.

  8. #8
    Do all 4-tecs have knock sensor adapters? I have 04 /GTX Limited that I bought with blown supercharger. Replaced supercharger, now getting knock sensor fault. Replaced fuel with 93 octane and some octane boost, checked sensor for 5 Megohms and that's ok. Shop manual says check resistance on knock sensor adapter. I don't see that mine has a knock sensor adapter - 2 pin plug from know sensor goes into another plug that disappears into major wire loom. Does it do any good to install a knock sensor adapter? On my ECM connections between contact 9 and 23 I have 5 Megohms. Engine seems to run OK. Fault driving me crazy!

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